MAXduino case for TZXduino / MaxDuino board from ProjectAVR

prusaprinters

<p>I bought this "MaxDuino" board on eBay. It emulates a tape player for retro-computing. As I intend to use the board for my Acorn machines, it was modified to support Motor Control via the 3.5mm stereo plug.</p><h4>Design</h4><p>I used Fusion 360 to design a simple case that has a slot for the MicroSD card, a cutout for the OLED display as well as 3.5mm audio out and the mini-USB power connector. All model files are available.</p><h4>PrusaSlicer settings</h4><ul><li>Plater presets: 0.2mm Quality, Prusament PETG</li><li>Print Settings&nbsp; &gt; Layers and Perimeters &gt; Vertical shells, increase to 3 perimeters</li><li>Print Settings &gt; Support Material &gt; uncheck "Don't support bridges" (Advanced mode setting)</li></ul><p>--&gt; By default, PrusaSlicer will NOT create supports under long bridging sections. The results were very poor with this default value.</p><h4>Supports</h4><ul><li>Choose "everywhere" for the supports to ensure the USB / audio / MicroSD ports are printed correctly</li><li>Then, use the "Paint-on supports" feature to REMOVE (right-click) supports from the icons on the buttons</li></ul><h4>Printing</h4><ul><li>I used PETG "Prusament" filament on my Prusa Mini printer.</li><li>Temperature settings etc. are left at default.</li><li>The top case is printed as a single part; the buttons are "hinge-type" just like on the Prusa Mini.<ul><li>This takes about 2.5 hours to print</li></ul></li><li>The bottom cover takes about 45 minutes to print</li></ul><h4>Assembly</h4><ul><li>The PCB fits quite tightly; you may have to slightly bend the case outward to allow the USB and audio connector to slide in</li><li>The bottom cover plate protects the PCB from short-circuits and other damage; it uses small 3x12mm self-tapping screws</li></ul><h4>Result</h4><p>Overall I'm quite happy with this first revision of the case:</p><figure class="image image_resized image-style-align-center" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/58527/rich_content/94e82ea6-7d84-4514-a8db-f66c4ff413e2/38a31ba1-1e17-4779-9c8b-879b8e6f8769_1_105_c.jpeg#%7B%22uuid%22%3A%221a6094c8-9aad-418d-ac0f-7b7b5fbb4743%22%2C%22w%22%3A1024%2C%22h%22%3A768%7D"></figure><p>There is some room for improvement:</p><ul><li>The MicroSD cutout has large overhangs that do not print nicely, even with full supports enabled.<ul><li>Not sure how to improve this - I'm open to suggestions</li></ul></li><li>The button icons have fairly large overhangs that are not always printed nicely.<ul><li>Perhaps use outlines instead of cutouts to improve print quality?</li></ul></li></ul><p>&nbsp;</p><figure class="image image_resized" style="width:75%;"><img src="https://media.prusaprinters.org/media/prints/58527/rich_content/22def58c-d87f-4b40-b4b2-75255c01a4e2/07da08d4-be51-47fb-9409-3e58d236b4ff_1_105_c.jpeg#%7B%22uuid%22%3A%22ad8f0bd0-a0bc-43cd-9b22-91e98d23c285%22%2C%22w%22%3A1024%2C%22h%22%3A768%7D"></figure><p>&nbsp;</p>